Florida’s wetlands cover a large share of the state and range from forested freshwater areas to mangrove-fringed coastal systems. The available figures span a 1996 statewide estimate, historic and current Everglades measurements, and more recent descriptions of protected coastal waters and restoration projects. Together, they show the scale, variety, and continuing management needs of Florida’s wetland landscapes.
Florida wetlands at a glance
- Estimated wetland area: 11.4 million acres in 1996.
- Share of the state: 29 percent of Florida’s land surface in that estimate.
- Freshwater share: About 90 percent of the state’s wetland area.
- Coastal share: About 10 percent.
- National context: Florida had a greater percentage of wetlands than any other conterminous state.
These statewide figures come from USGS Circular 1342. They describe an estimate for 1996, so they should not be read as a current inventory or as a direct measure of change through 2026. The acreage and percentage are useful for understanding the scale of Florida’s wetlands, while the habitat breakdown shows what makes up most of that area.
Freshwater wetland types in Florida
About 90 percent of Florida’s wetland area was freshwater in the USGS estimate. Within Florida’s freshwater wetlands, the reported composition was:
| Freshwater wetland type | Share of freshwater wetlands |
|---|---|
| Forested wetlands | About 55% |
| Marshes and emergent wetlands | About 25% |
| Scrub-shrub wetlands | About 18% |
| Freshwater ponds | About 2% |
Forested wetlands were the largest category, representing about 55 percent of freshwater wetlands. Marshes and emergent wetlands accounted for about 25 percent, while scrub-shrub wetlands represented about 18 percent. Freshwater ponds made up the remaining 2 percent. These percentages describe the freshwater portion, not the full statewide wetland total, and the source labels the overall statewide acreage as an estimate for 1996.
The freshwater-versus-coastal split also provides a useful statewide frame. If the 90 percent and 10 percent shares are considered together, freshwater wetlands clearly dominate the total area, but coastal wetlands remain important because they connect land, estuaries, islands, and nearshore waters. The figures should be kept as reported rather than converted into unsupported acreage calculations.
Everglades scale and change over time
The Everglades is one of the largest and most prominent wetland systems in Florida, but different authoritative sources describe different boundaries, dates, and terms. NOAA’s South Florida Ecosystem Restoration material says the Florida Everglades once spread over more than 8 million acres, while the Greater Everglades Ecosystem now encompasses nearly 4 million acres. Those figures refer to different historical and present-day descriptions of the broader system.
The US EPA’s Wetland Bioassessments in the Florida Everglades describes the historic Florida Everglades as approximately 4 million acres of shallow sawgrass marsh, wet prairies, and aquatic sloughs. The same source reports that only 50 percent of the original Everglades ecosystem remains today. Because these statements use different definitions and historical frames from the NOAA figures, they should not be combined into a single acreage trend without additional source context.
NOAA’s 2025 AOML summary gives another defined measurement: the Everglades ecosystem covers 2 million acres. The same summary says the Comprehensive Everglades Restoration Project, or CERP, spans over 35 years, covers 18,000 square miles, and reaches across six counties. These are project-scope figures rather than a replacement for the statewide wetland estimate.
NOAA describes South Florida restoration as the world’s largest intergovernmental watershed restoration effort. The Greater Everglades system is intended to serve water-related needs for over 9 million people. That population figure explains why the wetland system is managed not only as habitat, but also as part of a large water-supply and watershed infrastructure challenge.
Everglades treatment wetlands and phosphorus targets
Florida and federal agencies have constructed about 57,000 acres of treatment wetlands, known as stormwater treatment areas or STAs, according to the US EPA’s Everglades page. These constructed wetlands are designed to remove phosphorus before water enters the Everglades.
The EPA reports that the effort to treat water to the needed level is a $2 billion effort. The phosphorus target for Everglades protection is 10 parts per billion. These numbers describe a specific water-quality management program: 57,000 acres of treatment wetlands, a $2 billion effort, and a 10-parts-per-billion protection target.
The regulatory and monitoring history has its own dates. The Everglades Forever Act was passed in 1994. The EPA archive says phosphorus studies began in 1993 and continue to the present, while its biological-monitoring description says monitoring for Everglades phosphorus studies began in early 1994 in Water Conservation Area 2A. Those dates refer to different stages or descriptions of the research and monitoring record.
The Everglades Protection Area includes Water Conservation Areas 1, 2A, 2B, 3A, and 3B, along with Everglades National Park. Keeping the named areas together is important because the protection area is a network of managed and protected units rather than one uniform wetland parcel.
Mangroves and coastal wetland geography
NOAA’s Florida Keys 2011 Condition Report estimates that Florida’s mangrove forests cover about 496,000 acres, equivalent to 200,724 hectares. The same report says mangroves fringe much of the 1,700 islands in the Florida Keys sanctuary and 1,815 miles of shoreline within the sanctuary.
A separate NOAA mangrove forest page reports that more than 60 percent of mangroves in Monroe County have been destroyed for development since the 1950s. It also identifies 1996 as the year Florida’s Mangrove Trimming and Preservation Act was passed. The destruction figure is a historical statement about Monroe County, not a statewide loss percentage.
NOAA’s Florida Keys management plan uses another set of geographic counts, saying mangroves fringe 1,600 islands and 1,800 miles of shoreline within the sanctuary. These figures differ from the 1,700-island and 1,815-mile description in the 2011 condition report, so each is retained with its source rather than reconciled into an unsupported average.
The Florida Keys National Marine Sanctuary extends approximately 220 nautical miles southwest from the tip of Florida and covers 2,900 square nautical miles of coastal waters. The coral reef tract arches for 220 miles from the southern tip of Florida, and more than 6,000 patch reefs occur in nearshore and offshore environments in the Keys. The sanctuary supports over 6,000 species of plants, fishes, and invertebrates.
Protected waters and species diversity in the Keys
The Keys ecosystem includes 520 fish species, including over 260 reef fish species, along with 367 species of algae, 5 species of seagrasses, 117 species of sponges, 89 species of polychaete worms, 128 species of echinoderms, 2 species of fire coral, 55 species of soft corals, and 65 species of stony corals. Approximately 12,800 square kilometers of seagrass beds lie within and adjacent to the sanctuary.
The management plan also reports that, from 1979 through 1998, 263 fish species representing 54 families were observed in the Keys. More than half of all fish observed came from just 10 species. Since 1996, over 79 percent of 105 monitored stations in the Keys showed losses in stony coral diversity; 14 percent showed increases and 6 percent remained unchanged.
The sanctuary’s human scale is also quantified by NOAA. The Florida Keys have more than 77,000 residents and receive up to 5.5 million annual visitors. The local economy is nearly $5.0 billion, while tourism spending in Monroe County was $2.4 billion in 2018. Tourism spending supported 44 percent of jobs in Monroe County, and approximately 60 percent of the Keys economy is tied directly to marine-related activities.
Several protected areas add further measurements. The Key West National Wildlife Refuge encompasses over 375 square miles of open water and includes 2,019 acres of land. The Great White Heron National Wildlife Refuge extends over 264 square miles of open water. Key Largo National Marine Sanctuary protected 103 square nautical miles of coral reef habitat when designated in 1975, and Looe Key National Marine Sanctuary protects 5.32 square nautical miles of spur-and-groove coral reef. NOAA’s Office of National Marine Sanctuaries now serves a network of more than 620,000 square miles of marine and Great Lakes waters.
State conservation, aquatic preserves, and development pressure
Florida’s state-land history provides a broader land-use context. The Florida Department of Environmental Protection says more than 8 million acres of forest and wetland habitats have been developed in the last 50 years, equal to about 24 percent of the state. In 1990, a blue-ribbon commission warned that about 3 million acres of wetlands and forests could be converted by 2020 if the then-current pace continued.
The same Florida DEP source reports that Florida’s population has risen at an annual rate of approximately 4 percent since the 1950s. This is a historical growth-rate statement, not a current annual population forecast. It helps explain why wetland protection, water management, and land conversion have remained closely connected policy issues.
Florida has 43 aquatic preserves encompassing 2.9 million acres, according to the Florida DEP’s water topics information. Aquatic preserves are one part of the state’s larger network of wetland and coastal conservation areas, alongside national wildlife refuges, marine sanctuaries, and Everglades management units.
Rookery Bay and restoration examples
Florida’s Rookery Bay reserve contains 70,000 acres of open water within its boundary, representing 64 percent of the reserve. The remaining 40,000 acres are primarily mangroves, fresh to brackish water marshes, and uplands, according to NOAA’s Rookery Bay reserve page. The figures show how a coastal reserve can combine open water with several connected wetland and upland habitats.
Robinson Preserve offers a smaller restoration example. NOAA Fisheries reports that the preserve’s original farmland property was 482 acres, and a later donation expanded it by 150 acres. NOAA and partners restored nearly 135 acres of coastal habitat at Robinson Preserve. A related NOAA Fisheries account says the project used $9.4 million in NOAA funding through the Indian River Lagoon effort.
Taken together, these measurements place Florida wetlands on several scales: an estimated 11.4 million acres statewide in 1996, millions of acres in the Everglades and aquatic preserves, hundreds of thousands of acres of mangroves, and individual restoration projects measured in tens or hundreds of acres. The dates and boundaries matter, especially when comparing historic ecosystem extent, current management areas, and project-specific restoration results.